a = "Cali"
list = ["python","java","C"]
list.append("我是追加")
list.pop(0)
list.pop(2)
print(list)
if a in list:
    print("在列表里")
else:
    print("Cali不在列表里")

print(len(list))
lst = ["liu","cali",123,456]
list[1:0]=lst
print(list)
